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在区间[0,10]中,任意取一个数与6之和大于10的概率是 .
在区间[0,10]中,任意取一个数与6之和大于10的概率是 .
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下列有关命题的说法正确的是( )
A.“x
2=1”是“x=-1”的充分不必要条件
B.“x=2”是“x
2-5x+6=0”的必要不充分条件
C.命题“∃x∈R,使得x
2+x+1<0”的否定是:“∀x∈R,均有x
2+x+1<0”
D.命题“若x=y,则sinx=siny”的逆否命题为真命题
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现有五个球分别记为A,C,J,K,S,随机放进三个盒子,每个盒子只能放一个球,则K或S在盒中的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437008_ST/0.png)
B.
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D.
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有一笔统计资料,共有11个数据如下(不完全依大小排列)2,4,4,5,5,6,7,8,9,11,x,已知这组数据的平均数为6,则这组数据的方差为( )
A.6
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437007_ST/0.png)
C.66
D.6.5
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已知抛物线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437006_ST/0.png)
有相同的焦点F,点A是两曲线的交点,且AF⊥x轴,则双曲线的离心率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437006_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437006_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437006_ST/3.png)
D.
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双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437005_ST/0.png)
的渐近线方程是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437005_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437005_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230816344343764/SYS201311012308163443437005_ST/3.png)
D.
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